Center core for concrete pipes.



L. Y. STAYTON.

CENTER coma FOR CONCRETE PIPES.

APPLIOATION FILED BBPT. 19, 1012.

1 1 20, 1 02. Patented Dec. 8, 1914.

INVENTOI? R, [0/6020 j/ay/on WITNESSES.

Hz NORRIS PEIERS c0. PHOIOJJTHQ. WASHING ION. 0. C

LORENZO Y. STAYTON, OF TACOMA, WASHINGTON.

CENTER CORE FOR CONCRETE PIPES.

Specification of Letters Patent.

Patented Dec. 8, 1914.

Application filed September 19, 1912. Serial No. 721,164.

To all whom it may concern:

Be it known that I, Lonnnzo Y. STAY'roN, a citizen of the United States,and a resident of Tacoma, in the county of Pierce and State ofWashington, have invented a new and useful Center Core for ConcretePipes,

of which the following is a specification.

This invention relates to cores used in making concrete pipes, manholes,and other similar hollow structures, and has for its objects to providea core which is especially adapted for use when a pipe line is made inone continuous length, such being generally known as monolithicconstruction, in which. a core can be left in place until the concreteis thoroughly set and may then be reduced in size to pass through thecores adjacent to it which are being used (the concrete being not yetsufficiently set) and may be set up again in line therewith to form acore for a new length of pipe.

Other objects are to improve the means for holding the core sheet inextended or collapsed positions; and to provide aremovable reinforcementor rib for the core sheet.

I attain these and other objects by the devices illustrated in theaccompanying drawings in which- Figure 1 is a perspective view of thecore in shape for use; Fig. 2 is a similar view thereof When it isreduced; Figs. 3 and 4 are front elevations of a part of the core sheetshowing the edges thereof when it is extended for use and reduced,respectively, together with the holding means; Fig. 5 is an elevation ofone of the joints of one of the reinforcing rings; Fig. 6 is a plan ofone of said rings, folded; Fig. 7 is a section of a ring and a portionof the core sheet showing the clip on the sheet for holding the ring;and Fig. 8 is a longitudinal section of the core sheet as set up foruse.

Similar numerals of reference refer to similar parts throughout theseveral views.

The core sheet 1 is made of metal of such width as to extend entirelyaround the circumference of the inside of the pipe and of a convenientlength. When set up for use its edges 2 and 3 butt against each other(Figs. 1 and 3) but when it is reduced in size one edge 2 is drawnwithin the circle and is overlapped by the other edge 3 (Figs. 2 and4:). In order that the edges 2 and 3 will be brought into line to form acontinuous surface, I fix the projecting plates 4 at intervals to theedge 2 so as to overlap past the other edge 3 when the sheet is set up(Figs. 3 and 8).

In order to fixedly hold the sheet in extended or reduced positions Iprovide, at suitable intervals, the following fastening means :-An eye 5is secured near the edge 2 and a similar eye 6 is secured farther fromthe edge 3, the distance therefrom depend mg on the amount of lapbetween the edges when the sheet is reduced. A bar 7 is loosely mountedat one end in the latter eve 6 and has two hooks or projections 8 and 9thereon. The projection 8 is near the end of the bar which is mounted inthe eye (3 and the other hook 9 is formed on the end of the bar 7 and isremoved from the hook S bv the distance which the edges are to overlap.The projection 8 is oll'set toward the sheet 1. When the sheet isextended the hook 9 engages the eye 5 (Fig. 3) but when it is reducedthe said eye 5 is engaged by the inner hook 8 (Fig. l). Thus the sheetis held in either of its two positions. Now, when the sheet is in use,it is of course under considerable compressive strain from the softconcrete surrounding it, and since the sheet must be suilicientlyflexible to allow of its being reduced in diameter in order to be passedthrough the sheets in use, it is evident that while it is in use it mustbe reinforced. I accomplish this purpose by means of the folding ribs,illustrated in Figs. 58, which are placed at convenient intervals in thepipe.

A number of clips 10 are secured to the sheet 1 in suitable positionsthereof, each clip having its end offset from the sheet to allow one legof the angle-iron, of which the rib is constructed, to pass thereunderand be held thereby. The clips are shown in action in Fig. 7. I preferto have several of these clips in position to engage each rib. Each ribconsists of three pieces of angle-iron, all bent to the same circle andconnected together in such a way that they fold one toward the otherwhen collapsed (Fig. 6). The piece 11, forming one end of the rib, ishinged by a single pin 12 to the intermediate piece 13, the outer facesof the pieces being cut away so that when the two parts are extendedinto working position the ends thereof will abut, and the other leg ofone being offset at the joint so that the two pieces will lie in thesame plane. Similarly the third piece 14 is hinged by a pin 15 to theother end of the piece 13 but this pin 15 is located a short distancefrom the end of the said piece. The end of the piece 14, forming thejoint With the piece 13, is offset to lie under the leg of the piece 13(Fig. and has a pin 16 secured to it and extending outward from it, saidpin 16 engaging in a slot 17 formed close to the end of the piece 13,said slot being formed on a curve having the pin for its center. Theouter face of the end of the piece 14 is cut away at this joint to fitthe end of the face of the piece 13. The face of the other end of thepiece 14; is similarly cut away to fit the end of the face of the piece11, While the other leg thereof extends out from the face and is offsetto pass under the leg of the piece 11 and is provided With two pins 18,similar to the pin 16, extending therefrom and adapted to engage the tWoslots 19 in the piece 11, said slots'being formed on a curve having thepin 15 for its center When the pieces 11 and 13 are extended intooperative position. The rib thus formed is folded, as shown in Fig. 6,When it is to be removed out of place, but When it is in use it forms acomplete stiff circular rib extending entirely around the inside of thesheet.

Having described my invention What I claim is In a device of the classdescribed, the combination of a single sheet of flexible metal bent tobring its side edges together leg in each link being offset at its endsto overlap the corresponding leg of the ad j acent links and engagingsaid corresponding legs by means of pins.

LORENZO Y. STAYTON.

Witnesses:

A. J. HOLMES, E. G. JoHNsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. t."

